I have thunderbird 24.5.0; I am attempting to install lightning 2.6.5. Fails with "cannot modify the needed file". OS is win 8.1

Support notes talked about unpacking xpi files. All I want to do is install an add-on. I tried "extra all" and it failed. I need very explicit instructions on installing this add-on, please. It should not be this damn hard...

This ''sounds'' like a Windows 8.1 user permissions issue. I've installed Lightning into TB on Windows XP, 7 and various flavours of Linux with no trouble at all. I don't use Windows 8.
Has it asked for permission to make changes to the computer? Have you tried doing this installation with admin privileges? When I do bump into installation issues, and that's any program, not just TB, it's because I'm trying it on the computer at work where the IT department control what mere end-users are allowed to do.

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